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#include <u.h>
#include <libc.h>
#include <authsrv.h>
extern int form1check(char *ap, int n);
extern int form1M2B(char *ap, int n, uchar key[32]);
int
convM2T(char *ap, int n, Ticket *f, Authkey *k)
{
uchar buf[MAXTICKETLEN], *p;
int m;
if(f != nil)
memset(f, 0, sizeof(Ticket));
if(n < 8)
return -8;
if(form1check(ap, n) < 0){
m = 1+CHALLEN+2*ANAMELEN+DESKEYLEN;
if(n < m)
return -m;
if(f == nil || k == nil)
return m;
f->form = 0;
memmove(buf, ap, m);
decrypt(k->des, buf, m);
} else {
m = 12+CHALLEN+2*ANAMELEN+NONCELEN+16;
if(n < m)
return -m;
if(f == nil || k == nil)
return m;
f->form = 1;
memmove(buf, ap, m);
if(form1M2B((char*)buf, m, k->pakkey) < 0)
return m;
}
p = buf;
f->num = *p++;
memmove(f->chal, p, CHALLEN), p += CHALLEN;
memmove(f->cuid, p, ANAMELEN), p += ANAMELEN;
memmove(f->suid, p, ANAMELEN), p += ANAMELEN;
memmove(f->key, p, f->form == 0 ? DESKEYLEN : NONCELEN);
f->cuid[ANAMELEN-1] = 0;
f->suid[ANAMELEN-1] = 0;
return m;
}
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